New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metals

Ulrik Grønbjerg Vej-Hansen; M. Escudero-Escribano; Amado Andres Velazquez-Palenzuela; Paolo Malacrida; Jan Rossmeisl; I. E. L. Stephens; Ib Chorkendorff; Jakob Schiøtz

doi:10.1007/s12678-017-0375-9

New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metals

Ulrik Grønbjerg Vej-Hansen
, M. Escudero-Escribano
, Amado Andres Velazquez-Palenzuela
, Paolo Malacrida
, Jan Rossmeisl
, I. E. L. Stephens
, Ib Chorkendorff
, Jakob Schiøtz

University of Copenhagen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The energy efficiency of polymer electrolyte membrane fuel cells is mainly limited by overpotentials related to the oxygen reduction reaction (ORR). In this paper, we present new platinum alloys which are active for the ORR and based on alloying Pt with very abundant elements, such as Ca. Theoretical calculations suggested that Pt₅Ca and Pt₅Sr should be active for the ORR. Electrochemical measurements show that the activity of sputter-cleaned polycrystalline Pt₅Ca and Pt₅Sr electrodes is enhanced by a factor of 5–7 relative to polycrystalline Pt. Accelerated stability testing shows that after 10,000 electrochemical cycles, the alloys still retain over half their activity. The stability is thus not quite on par with the similar Pt-lanthanide alloys, possibly due to the somewhat lower heat of formation.

Original language	English
Journal	Electrocatalysis
Volume	8
Issue number	6
Pages (from-to)	594-604
Number of pages	11
ISSN	1868-2529
DOIs	https://doi.org/10.1007/s12678-017-0375-9
Publication status	Published - 2017

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Oxygen reduction reaction
Platinum alloys
Alkaline earths

Access to Document

10.1007/s12678-017-0375-9

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@article{46b7adac5700431b819aa09a2d065715,

title = "New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metals",

abstract = "The energy efficiency of polymer electrolyte membrane fuel cells is mainly limited by overpotentials related to the oxygen reduction reaction (ORR). In this paper, we present new platinum alloys which are active for the ORR and based on alloying Pt with very abundant elements, such as Ca. Theoretical calculations suggested that Pt5Ca and Pt5Sr should be active for the ORR. Electrochemical measurements show that the activity of sputter-cleaned polycrystalline Pt5Ca and Pt5Sr electrodes is enhanced by a factor of 5–7 relative to polycrystalline Pt. Accelerated stability testing shows that after 10,000 electrochemical cycles, the alloys still retain over half their activity. The stability is thus not quite on par with the similar Pt-lanthanide alloys, possibly due to the somewhat lower heat of formation.",

keywords = "Oxygen reduction reaction, Platinum alloys, Alkaline earths",

author = "Vej-Hansen, \{Ulrik Gr{\o}nbjerg\} and M. Escudero-Escribano and Velazquez-Palenzuela, \{Amado Andres\} and Paolo Malacrida and Jan Rossmeisl and \{L. Stephens\}, \{I. E.\} and Ib Chorkendorff and Jakob Schi{\o}tz",

year = "2017",

doi = "10.1007/s12678-017-0375-9",

language = "English",

volume = "8",

pages = "594--604",

journal = "Electrocatalysis",

issn = "1868-2529",

publisher = "Springer Publishing Company",

number = "6",

}

TY - JOUR

T1 - New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metals

AU - Vej-Hansen, Ulrik Grønbjerg

AU - Escudero-Escribano, M.

AU - Velazquez-Palenzuela, Amado Andres

AU - Malacrida, Paolo

AU - Rossmeisl, Jan

AU - L. Stephens, I. E.

AU - Chorkendorff, Ib

AU - Schiøtz, Jakob

PY - 2017

Y1 - 2017

N2 - The energy efficiency of polymer electrolyte membrane fuel cells is mainly limited by overpotentials related to the oxygen reduction reaction (ORR). In this paper, we present new platinum alloys which are active for the ORR and based on alloying Pt with very abundant elements, such as Ca. Theoretical calculations suggested that Pt5Ca and Pt5Sr should be active for the ORR. Electrochemical measurements show that the activity of sputter-cleaned polycrystalline Pt5Ca and Pt5Sr electrodes is enhanced by a factor of 5–7 relative to polycrystalline Pt. Accelerated stability testing shows that after 10,000 electrochemical cycles, the alloys still retain over half their activity. The stability is thus not quite on par with the similar Pt-lanthanide alloys, possibly due to the somewhat lower heat of formation.

AB - The energy efficiency of polymer electrolyte membrane fuel cells is mainly limited by overpotentials related to the oxygen reduction reaction (ORR). In this paper, we present new platinum alloys which are active for the ORR and based on alloying Pt with very abundant elements, such as Ca. Theoretical calculations suggested that Pt5Ca and Pt5Sr should be active for the ORR. Electrochemical measurements show that the activity of sputter-cleaned polycrystalline Pt5Ca and Pt5Sr electrodes is enhanced by a factor of 5–7 relative to polycrystalline Pt. Accelerated stability testing shows that after 10,000 electrochemical cycles, the alloys still retain over half their activity. The stability is thus not quite on par with the similar Pt-lanthanide alloys, possibly due to the somewhat lower heat of formation.

KW - Oxygen reduction reaction

KW - Platinum alloys

KW - Alkaline earths

U2 - 10.1007/s12678-017-0375-9

DO - 10.1007/s12678-017-0375-9

M3 - Journal article

SN - 1868-2529

VL - 8

SP - 594

EP - 604

JO - Electrocatalysis

JF - Electrocatalysis

IS - 6

ER -

New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metals

Abstract

UN SDGs

Keywords

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